Rolling mill with segmental rolls



Sept. 15, 1959 F. A. MCNULTY ROLLING MILL WITH SEGMENTAL ROLLS FiledJuly 23, 1956 3 Sheets-Sheet 1 Sept. 15, 1959 Filed July 23, 1956 F. A.M NULTY ROLLING MILL WITH SEGMENTAL ROLLS 5 Sheets-Sheet 2 P 1959 F. A.MCNULTY 2,903,925

I ROLLING MILL WITH SEGMENI'AL ROLLS Filed July 25', 1956 a Sheets-Sheets United States Patent ROLLING NULL WITH SEGMENTAL ROLLS FrederickAndrew McNulty, Bedford, England, assignor to W. H. A. Robertson &Company Limited, Bedford, England Application July 23, 1956, Serial No.599,619 Claims priority, application Great Britain August 5, 1955 1Claim. (Cl. 80- 14) This invention relates to rolling mills of the kindcomprising a reciprocatory roll-carrying housing, and means including arack-and-pinion mechanism for imparting rotational motions from thehousing to the rolls. Mills of this kind are used for such purposes asreducing or otherwise shaping metal tubes or bars.

When it becomes necessary to recondition the rolls, a machine of thekind aforesaid and of previously known construction must of necessity beput out of action for the time required to effect the reconditioningwith consequent loss of productivity.

The object of the present invention is to enable the above disadvantageto be obviated in a simple and convenient manner.

A mill of the kind aforesaid and in accordance with the inventioncomprises the combination of a recipro catory carriage, and aself-contained roll unit removably mounted on the carriage, the saidunit being replaceable by a stand-by unit.

In the accompanying drawings:

Figure l is a front elevation and Figure 2 a cross section on the line22 of Figure 1 illustrating a selfcontained roll unit in accordance withthe invention.

Figure 3 is a side elevation, Figure 4 a plan, and Figure 5 a crosssection on the line 55 of Figure 3 illustrating a mill provided with theunit shown in Figures 1 and 2.

Referring to the drawings, there is provided a bed 6 on which are formeda pair of parallel horizontal tracks 7. Also on the bed, and at the samelevel as the tracks, are mounted a pair of horizontal racks 8. On thebed is supported a carriage 9 which consists essentially of arectangular frame, the carriage :being supported on the said tracks 7 byrollers 10. Reciprocatory motion is imparted to the carriage 9 by anoscillatory arm 11 which Patented Sept. 15, 1959 at one end is connectedby links 12 to the carriage and which at the other end is connected tolinks 13, the latter being actuated by a crank mechanism (not shown).

The roll unit consists of a housing 14 on which are mounted a pair ofinteracting rolls 15 having working grooves formed on the rolls, or oninserts removably secured to the rolls. Preferably the housing comprisesupper and lower parts each adapted to carry a roll, the two parts beingheld together by hydraulically pre-stressed bolts 16 in a known manner.

The rolls are interconnected by pairs of pinions 17 on the ends of theroll spindles, and on each end of the upper roll spindle is also secureda pinion 18 for engagement with the corresponding rack 8 on the bed.

The roll unit is detachably mounted on the carriage and is securedthereto by keys, wedges or other means.

When it is required to recondition the rolls, it is merely necessary torelease the roll unit and after lifting it oif the carriage replace itby a stand-by unit, the whole operation operation being capable of beingperformed in a short time and without disturbance of any other part ofthe mills.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is:

A rolling mill comprising in combination a supporting base, a carriagehaving a pocket open at its upper end, said carriage being movablysupported on the base, mechanism connected to the carriage for impartinglinear reciprocatory movements to the carriage, a toothed rack supportedon the base and extending parallel to the direction of carriage movementwith its teeth facing upwardly, a self-contained unit comprising a frameseated in said pocket and removable through the upper open end thereof,bearing means mounted in said frame, a pair of rolls rotatably supportedin said bearing means, interrneshing pinions secured to the rolls and arack-engaging pinion secured to one roll and engaging said rack forimparting rotational movements to the rolls in response to reciprocationof the carriage.

References Cited in the file of this patent UNITED STATES PATENTS1,628,175 Moller May 10, 1927 2,147,301 Krause Feb. 14, 1939 2,436,098Coe Feb. 17, 1948 2,537,356 Larsson Jan. 9, 1951 2,703,999 Gille Mar.15, 1955

